"ABYSS is a training and career development platform for young scientists in Geodynamics, Mineralogy, Hydrodynamics, Thermodynamics and (Bio-)Geochemistry focusing on mid-ocean ridge processes and their environmental and economic impacts. It brings together 10 European research groups internationally recognized for their excellence in complementary disciplines and 4 Associated Partners from the Private Sector. ABYSS will provide training for 12 Early Stage Researchers and 3 Experienced Researchers through a structured and extensive program of collaboration, training and student exchange. ABYSS aims at developing the scientific skills and multi-disciplinary approaches to make significant advances in the understanding of the coupled tectonic, magmatic, hydrothermal and (bio-)geochemical mechanisms that control the structure and composition of the oceanic lithosphere and the microbial habitats it provides. An improved understanding of these complex processes is critical to assess the resource potential of the deep-sea. ABYSS will specifically explore processes with implications for economy and policy-making such as carbonation (CO2 storage), hydrogen production (energy generation) and the formation of ore-deposits. ABYSS will also emphasize the importance of interfacial processes between the deep Earth and its outer envelopes, including microbial ecosystems with relevance to deep carbon cycling and life growth on the Primitive Earth. The ABYSS training and outreach programme is set up to promote synergies between research and industry, general public and policy makers. The main outcome of ABYSS will be twofold (i) develop a perennial network of young scientists, sharing a common technical and scientific culture for bridging the gaps in process understanding and make possible the exploitation of far off-shore mining of marine resources; (ii) to address the need to develop pertinent policies at the European and international level for preserving these unique environments."